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Spontaneously enhanced visible-light-driven photocatalytic water splitting of type Ⅱ PG/AlAss van der Waal heterostructure:A first-principles study

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Chinese Chemical Letters 2023年第12期34卷 354-360页

作者： Wenxue Zhang Jiating Hou Min Bai Cheng He Jiuran Wen School of Materials Science and Engineering Changan UniversityXi'an 710064China State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi'an Jiaotong University.Xi'an 710049China

To solve the problem of energy scarcity and widespread environmental contamination,it is necessary to design green and low-cost photocatalysts for water *** this paper,a new penta-graphene/AlAs_(5)(PG/AlAss)van der Waals(vdW)heterostructure is proposed and its performance for photocatalytic hydrolysis is calculated using the first-principles *** findings suggest that the PG/AIAss heterostructure belong to type-ll indirect semiconductor,and the edge position and band gap width of this heterostructure satisfy the requests of redox ***,the oxidation reaction(OER)on the AIAss side and the hydrogen evolution reaction(HER)on the PG side are thermodynamically spontaneous under different ***,the introduction of strain engineering has changed the position of the band edge and light absorption performance of PG/AlAss heterostructure,which is powerful for the performance of photocatalytic water *** PG/AlAs_(5) vdw heterostructure exhibits well visible light absorption intensity without applying strain and biaxial strain of 2%.In conclusion,the findings suggest that the PG/AlAss vdW heterostructure is a prospecting catalyst for visible-light hydrolysis.

关键词： PG/AlAs_(5)vdW heterostructure Type-ll semiconductor Water splitting Density functional theory Visible photocatalysis

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Research status and prospects of the fractal analysis of metal material surfaces and interfaces

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International Journal of Minerals,Metallurgy and materials 2025年第1期32卷 20-38页

作者： Qinjin Dai Xuefeng Liu Xin Ma Shaojie Tian Qinghe Cui Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Beijing Laboratory of Metallic Materials and Processing for Modern Transportation University of Science and Technology BeijingBeijing 100083China Laboratory for Advanced Materials Processing of Ministry of Education University of Science and Technology BeijingBeijing 100083China School of Mechanical and Electrical Engineering Xinjiang Institute of EngineeringUrumqi 830023China

As a mathematical analysis method,fractal analysis can be used to quantitatively describe irregular shapes with self-similar or self-affine *** analysis has been used to characterize the shapes of metal materials at various scales and *** methods make it difficult to quantitatively describe the relationship between the regular characteristics and properties of metal material surfaces and ***,fractal analysis can be used to quantitatively describe the shape characteristics of metal materials and to establish the quantitative relationships between the shape characteristics and various properties of metal *** the perspective of two-dimensional planes and three-dimensional curved surfaces,this paper reviews the current research status of the fractal analysis of metal precipitate interfaces,metal grain boundary interfaces,metal-deposited film surfaces,metal fracture surfaces,metal machined surfaces,and metal wear *** relationship between the fractal dimensions and properties of metal material surfaces and interfaces is *** from three perspectives of fractal analysis,namely,research scope,image acquisition methods,and calculation methods,this paper identifies the direction of research on fractal analysis of metal material surfaces and interfaces that need to be *** is believed that revealing the deep influence mechanism between the fractal dimensions and properties of metal material surfaces and interfaces will be the key research direction of the fractal analysis of metal materials in the future.

关键词： metal material surfaces and interfaces fractal analysis fractal dimension homogeneity

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Quasi-two dimensional Ruddlesden−Popper halide perovskites for laser applications

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Frontiers of physics 2024年第2期19卷 53-71页

作者： Kun Chen Qianpeng Zhang Yin Liang Jiepeng Song Chun Li Shi Chen Fang Li Qing Zhang School of Mechanical and Electrical Engineering Wuhan Institute of TechnologyWuhan 430205China School of Materials Science and Engineering Peking UniversityBeijing 100871China Institute of Applied Physics and Materials Engineering Macao UniversityMacao 999078China

Quasi-two-dimensional(2D)Ruddlesden‒Popper(RP)halide perovskites,as a kind of emerged two-dimensional layered materials,have recently achieved great attentions in lasing materials field owing to their large exciton binding energy,high emission yield,large optical gain,and wide-range tuning of optical *** review will introduce research progresses of RP halide perovskites for lasing applications in aspects of materials,photophysics,and devices with emphasis on emission and lasing properties tailored by the molecular composition and *** materials,structures and fabrications are introduced in the first ***,the optical transitions and amplified spontaneous emission properties are discussed from the aspects of electronic structure,exciton,gain dynamics,and interface ***,the research progresses on lasing devices are summarized and several types of lasers including VCSEL,DFB lasers,microlasers,random lasers,plasmonic lasers,and polariton lasers are *** last,the challenges and perspectives would be provided.

关键词： two-dimensional materials metal halide perovskite Ruddlesden−Popper halide perovskites lasing emission

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Spatially-graded 3D-printed viscoelastic truss metamaterials for impact trajectory control and energy absorption

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Theoretical & Applied Mechanics Letters 2024年第5期14卷 378-385页

作者： Kaoutar Radi Raphaël N.Glaesener Siddhant Kumar Dennis M.Kochmann Mechanics&Materials Lab Department of Mechanical and Process EngineeringETH Zürich 8092Switzerland Mechanics&Materials Computing Lab Department of Materials Science&EngineeringTU Delft 2628 CNNetherlands

This study demonstrates that two-and three-dimensional spatially graded,truss-based polymeric-material metamaterials can be designed for beneficial impact mitigation and energy absorption *** a combination of numerical and experimental techniques,we highlight the broad property space of periodic viscoelastic trusses,realized using 3D printing via selective laser *** beyond periodic designs,we investigate the impact response of spatially variant viscoelastic lattices in both two and three *** result reveal that introducing spatial variations in lattice topology allows for redirecting of the impact trajectory,opening new opportunities for engineering and tailoring lightweight materials with target impact *** is achieved through the combined selection of base material and metamaterial design.

关键词： Metamaterial 3D Printing Viscoelasticity Impact Truss Finite element method

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Experimental investigation and optimization of cutting parameters during dry turning process of copper alloy

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Journal of engineering and Applied science 2023年第1期70卷 145页

作者： Tefera, Aklilu Getachew Sinha, Devendra Kumar Gupta, Gaurav Department of Mechanical Engineering School of Mechanical Chemical and Materials Engineering Centre of Advanced Manufacturing Engineering Adama Science and Technology University Adama Ethiopia Mechanical Engineering Department Amity School of Engineering Noida India

Increasing the quality and productivity of machined components are the main issues of machining operations in metalworking industries. The copper alloys CuZr and CuCrZr generally find applications for current-carrying structural components, seam welder wheels, shafts, and bearings flash. The manufacturing of these components is still facing challenges in the form of machining process characteristics. One of the most common machining operations for removing material is turning that produces reasonably good surface finish quality, which is influenced by different factors (speed of cut, rate of feed, tool geometry, cutting fluid, cutting tool, etc.). This research has focused on experimental study and optimization of the cutting parameters viz. cutting speed, depth of cut, and feed, for best surface finish, material removal rate, tool tip temperature as well as surface morphology during dry turning of C15000 and C18150 copper alloy using High-Speed Steel (HSS) tool The plan and design of experiment has been performed through orthogonal Taguchi L9. array. The optimum cutting settings were discovered by using the Taguchi technique and using the performance index by applying a Grey Relational Grade (GRG). The best cutting parameters for both materials were a cutting speed 1200 rpm, feed rate 0.06 mm/rev, and depth of cut 1.25 mm. The optimum factors obtained from GRA for all responses (surface roughness, MRR, and tool temperature) at the best level of cutting parameters are the same for both materials. These cutting parameters values yielded the experimental result for each response like surface roughness, MRR, and tool tip temperature (2.5 µm,12,475 mm3/min, and 74 °C) for grade C15000 whereas (2.39 µm, 2590mm3/min and 68 °C) for grade C18150. The optimization of cutting parameters plays a vital role in the improvement of surface finish which minimizes mechanical failures caused by wear, corrosion, and thereby increasing the productivity of the products. This investigati

关键词： Surface roughness

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Achieving durable double-layered thermal barrier coatings by tailoring multi-scale structures

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Journal of Advanced Ceramics 2024年第12期13卷 2068-2086页

作者： Guang-Lei Liu Lin Zhu Xin-Yu Li Hussain Sajjad Xiang-Yu Song Guang-Rong Li Guan-Jun Yang State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China

Double-layered thermal barrier coatings(DL-TBCs)have been developed to meet multiple service requirements,such as low thermal conductivity,high thermal stability,and high fracture *** DL-TBCs are often designed on the basis of equal total thickness to have long lifespans,which may weaken the thermal *** reason is that the single-scale designed structure often has opposite effects on the thermal and mechanical *** enhance both the thermal insulation and lifespan,this work designed durable DL-TBCs at multiple scales under equivalent thermal *** macroscopic thickness ratio of the top layer to the bottom layer was tailored to optimize the total and single thicknesses,and the microscopic pore size in the top layer was tailored to resist *** groups of samples with different thickness ratios were *** thermal cycling test revealed that the lifespan of DL-TBCs first increases but then decreases with increasing thickness *** optimized thickness ratio is 2:3 for DL-TBCs,which have the largest lifespan among the six *** cross-sectional morphologies revealed that the failure mode changed from the spallation of the top layer to the delamination of the total double *** long lifespan of the optimized DL-TBCs stems from the cotailored thickness ratio and porous structure in the top layer to lower the total cracking driving force.

关键词： thermal barrier coatings(TBCs) double-layered structure dominant factors multiscale design long lifespan

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Conjugate ferrocene polymer derived magnetic Fe/C nanocomposites for electromagnetic absorption application

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Journal of materials science & Technology 2024年第8期175卷 125-131页

作者： Aming Xie Zhendong Ma Ziming Xiong Weijin Li Lai Jiang Qiu Zhuang Siyao Cheng Wei Lu School of Mechanical Engineering Nanjing University of Science&TechnologyNanjing 210094China State Key Laboratory of Explosion&Impact and Disaster Prevention&Mitigation Army Engineering University of PLANanjing 210007China School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing 210094China Shanghai Key Lab.of D&A for Metal-Functional Materials School of Materials Science&EngineeringTongji UniversityShanghai 201804China

Coordination bonds are relatively unstable compared to covalent bonds,and common carbon-based absorbing material precursors are bonded in the form of coordination *** this work,we have introduced ferrocene units into conjugated microporous polymers(CMP)in one step by Suzuki *** adjusting the proportion of ferrocene units,a series of magnetic Fe-C nanocomposites(Fe-P-XC)derived from conjugated ferrocene polymers without heteroatom doping(N,S,P,etc.)were *** Fe-P-2C composite has good absorption properties with minimum reflection loss at 4.4 GHz(-58.66 dB)and effective absorption bandwidth(EAB)of 6.28 GHz at 2.4 mm(11.72-18 GHz).Compared with the precursor materials formed by coordination bonds,the present work reveals the electromagnetic wave absorption mechanism of carbon-based materials without heteroatom doping through a simple and effective strategy.

关键词： Covalent bonds Suzuki reaction Conjugated ferrocene polymers Electromagnetic wave absorption

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Improving thermal stability and creep resistance by Sc addition in near-αhigh-temperature titanium alloy

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Journal of materials science & Technology 2024年第16期183卷 1-11页

作者： Xiuyang Zhong Tongsheng Deng Wenlong Xiao Xiaochun Liu Zhi Liu Yucheng Yang Olanrewaju A.Ojo Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and TechnologyGanzhou 341000China School of Materials Science and Engineering Beihang UniversityBeijing 100191China Institute of Metals College of Materials Science and EngineeringChangsha University of Science&TechnologyChangsha 410004China Department of Mechanical Engineering University of ManitobaWinnipegMB R3T 5V6Canada

High-temperature titanium alloys’thermal stability and creep resistance are significant during service in high *** study systematically investigated the thermal stability and mechanical properties of Ti-6.5A1-2.5Sn-9Zr-0.5Mo-1Nb-1W-0.3Si-xSc(x,0-0.5 wt.%)at 650°*** lamellar secondaryαphase is refined and the formation of Sc_(2)O_(3)is increased with the increasing scandium(Sc)additions,which im-proves the strength of the alloy,while excessive Sc_(2)O_(3)becomes the crack source and deteriorates the *** oxygen content in the matrix is reduced by the interaction between Sc and oxygen,in-hibiting the growth of the Ti3 Al phase and improving the thermal stability of the ***,Sc accelerates the dissolution of the residualβphase and precipitation of fine,diffusely distributed ellip-soidal silicides,which strongly prevents dislocation *** enhancement of creep resistance for the Sc-containing alloy is attributed to the refined lamellar secondaryαphases,Sc_(2)O_(3)particles,Ti3 Al phase,and silicides,especially the precipitated ***,the 0.3 Sc alloy shows optimal ther-mal stability(the plasticity loss rate 17.3%)and creep resistance(steady-state creep rate 4.4×10^(-7) s^(-1)).The investigation results provide new insights into the mechanism and thermal stability improvement in high-temperature titanium alloys modified by rare earth(RE).

关键词： Titanium alloy Creep Microstructure Silicide Scandium

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Two-dimensional interface superstructures assembled by well-ordered solute atoms

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Journal of materials science & Technology 2023年第11期142卷 253-259页

作者： Peijun Yang Shanshan Li Hongbo Xie Jianfeng Jin Chuangwei Liu Hucheng Pan Yuping Ren Weitao Jia Yaping Zong Gaowu Qin Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China School of Mechanical and Power Engineering Shenyang University of Chemical TechnologyShenyang 110142China College of Mechanical Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China

Segregation of solutes/impurities in the interfaces plays a decisive role in material ***,the segregation of solutes/impurities remains elusive due to the diversity of interfacial ***,in a Mg-Nd-Mn ternary model system,two ordered novel two-dimensional(2D)interfacial superstructures formed by periodic segregation of solute atoms in special symmetric and asymmetric tilt grain boundaries(GBs)have been systematically investigated.Z-Contrast high-angle annular dark-field scanning transmission electron microscopy(HAADF-STEM)observations provided the atomic-level details on how solute atoms were arranged on these special partially coherent tilt *** strained conditions of each atomic site at the tilt GBs were accurately reproduced by molecular dynamics(MD)simulations plus Voronoi analysis,and the rationality of solute segregation in each atomic-site was evaluated carefully based on the first-principles *** findings expand our knowledge of solute/impurity segregation behaviors in the interfaces,especially the co-segregation behaviors in multi-component materials.

关键词： Magnesium alloy Interfacial segregation Molecular dynamics First-principles HAADF-STEM

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A self-assembling nanoplatform for pyroptosis and ferroptosis enhanced cancer photoimmunotherapy

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Light(science & Applications) 2025年第1期14卷 153-166页

作者： Zhichao Wang Yuqi Tang Quan Li Institute of Advanced Materials and School of Chemistry and Chemical Engineering Southeast UniversityNanjing211189China Materials Science Graduate Program Kent State UniversityKentOH44242USA

The microenvironment of immunosuppression and low immunogenicity of tumor cells has led to unsatisfactory therapeutic effects of the currently developed *** cell death,such as pyroptosis and ferroptosis,can efficiently boost antitumor ***,the exploration of nanoplatform for dual function inducers and combined immune activators that simultaneously trigger pyroptosis and ferroptosis remains ***,a multifunctional pH-responsive theranostic nanoplatform(M@P)is designed and constructed by self-assembly of aggregation-induced emission photosensitizer MTCN-3 and immunoadjuvant Poly(l:C),which are further encapsulated in amphiphilic *** nanoplatform is found to have the characteristics of cancer cell targeting,pH response,near-infrared fluorescence imaging,and lysosome ***,after targeting lysosomes,M@P can cause lysosome dysfunction through the generation of reactive oxygen species and heat under light irradiation,triggering pyroptosis and ferroptosis of tumor cells,achieving immunogenic cell death,and further enhancing immunotherapy through the combined effect with the immunoadjuvant Poly(I:C).The anti-tumor immunotherapy effect of M@P has been further demonstrated in in vivo antitumor experiment of 4T1 tumor-bearing mouse model with poor *** research would provide an impetus as well as a novel strategy for dual function inducers and combined immune activators enhanced photoimmunotherapy.

关键词： immunotherapy cancer aggregation

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